Chris, Sounds like a good use of IR to help confirm a suspicion. However, my opinion is that IR should not be "Included with the home inspection". I only offer it as a separate service only to be done under the right conditions. As you mentioned the delta T is critical. Many times of the year in many parts of the country there will be less than ideal conditions to do a good / proper building envelope Infrared evaluation. Any thing less than the 18 degree F delta T ( for those not familiar with the term, the difference between the interior temperature and the exterior temperature) and you risk of not seeing something that is there and / or misinterpreting what you see. I'm not saying that you cant see things with less than an 18 degree difference but if there is , you better have an explanation / disclaimer in your report. I'm sure you know that some times this can be adjusted for by controlling the interior temp. But the best bet is to do the IR evaluation early in the morning. Like 6 or 7 AM. Not exactly the best time for most home owners, buyers, or agents. After having owned the camera for about a year and getting the necessary IR education (Level II Certification) I've come to believe that this is not an "Inspection tool" but it is a tool that can, under the right conditions, be used by someone with the proper training and a a very good knowledge of construction, be used for inspections. Herb Scott